arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2103.16402math.DGmath-phmath.APmath.MP
收藏

零超曲面中的中曲率流与MOTS的检测

Mean curvature flow in null hypersurfaces and the detection of MOTS

Henri Roesch, Julian Scheuer

摘要:

研究了三维零超曲面中的中曲率流。在一个时空中,如果超曲面的诱导度规是退化的,则称它为零。类空曲面在零超曲面中的中曲率流的速度是余维2的中曲率向量在零超曲面上的投影。我们在零超曲面上施加相当温和的条件。然后,对于一个外非捕获初始曲面,我们证明了该曲面的中曲率流始终存在并光滑收敛到一个边缘外捕获曲面(MOTS).作为一个应用,我们得到的存在性的整体叶理的过去的最外层MOTS,提供零超曲面承认一个un-trapped叶理渐近。

英文摘要:

We study the mean curvature flow in 3-dimensional null hypersurfaces. In a spacetime a hypersurface is called null, if its induced metric is degenerate. The speed of the mean curvature flow of spacelike surfaces in a null hypersurface is the projection of the codimension-two mean curvature vector onto the null hypersurface. We impose fairly mild conditions on the null hypersurface. Then for an outer un-trapped initial surface, a condition which resembles the mean-convexity of a surface in Euclidean space, we prove that the mean curvature flow exists for all times and converges smoothly to a marginally outer trapped surface (MOTS). As an application we obtain the existence of a global foliation of the past of an outermost MOTS, provided the null hypersurface admits an un-trapped foliation asymptotically.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑